package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;

import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {


    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     * @throws Exception
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws Exception {
        log.info(file.toString());
        //判断basePath是否存在
        File dir = new File(basePath);
        if (!dir.exists()){
            //不存在,则创建
            dir.mkdirs();
        }
        //获取原文件原始名
        String originalFilename = file.getOriginalFilename();
        //获取后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //根据UUID随机生成文件名
        String filename = UUID.randomUUID().toString()+suffix;

        //文件转存
        file.transferTo(new File(basePath+filename));

        return R.success(filename);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     * @throws Exception
     */
    @GetMapping("/download")
    public void download(String name,HttpServletResponse response) throws Exception {
        //输入流:读数据
        FileInputStream is = new FileInputStream(basePath+name);
        //输出流写数据.使用response
        ServletOutputStream os = response.getOutputStream();
        //拷贝文件
        IOUtils.copy(is,os);
        //关流
        is.close();
    }
}